You may be refering to the IS&S intallation that turns the 757/767 into something like the B777/747-4. Google it and I think you will find some photographs. FedEx, American and a few others have adopted it for their fleets. Only takes three days down time and reportedly costs less than $400,000 which isn't bad when you think of the cost of one symbol geneerator at around $125,000.